<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div style="width:300px;height: 400px; background: green ; margin: 10px"></div>
    <div style="width:300px;height: 400px; background: green ; margin: 10px; padding: 10px"></div>
    <div style="width:300px;height: 400px; background: green ; margin: 10px; padding: 10px; border: 5px solid yellow"></div>
</body>
</html>